Handle null policyValue in Create a Trusted Type (#527)

SHA: cf78f7e
Reason: push, by mbrodesser-Igalia

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

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 	“[trusted-types] <em>…summary of comment…</em>” </p>
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@@ -2036,6 +2036,8 @@ <h3 class="heading settled" data-level="3.2" id="create-a-trusted-type-algorithm
      <p>If the algorithm threw an error, rethrow the error and abort the following steps.</p>
     <li data-md>
      <p>Let <var>dataString</var> be the result of stringifying <var>policyValue</var>.</p>
+    <li data-md>
+     <p>If <var>policyValue</var> is null or undefined, set <var>dataString</var> to the empty string.</p>
     <li data-md>
      <p>Return a new instance of an interface with a type
 name <var>trustedTypeName</var>, with its associated data value set to <var>dataString</var>.</p>